Brother MFC-5890CN - Manual (Page 63)

Wireless configuration for Windows ® using the Brother installer application (Not available for MFC-5490CN and MFC-5890CN)
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You need to temporarily change your PC’s wireless settings. Please follow the on-screen instructions.
Please make sure you take notes on all the settings such as SSID or channel of your PC. You will need
them to return your PC back to its original wireless settings.
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To communicate with the un-configured wireless machine, temporarily change the wireless settings on
your PC to match machine’s default settings shown on this screen. Click Next.